A Place where students explore Math

john: Hey, Casey. What are you doing?casey: I'm doing some math work, john.john: Would you like some help?casey: Yes, I would. My first question is n+3-5n+12. The answer I got is -6n+15.john: That is incorrect.john: it is actually -4n+15 because the positive n and one of the negative n cancel each other outcasey: oh i see, i have trouble with another question it 's ,2 + 4 bracket 3n+8 bracket.john: what do you think the answer is ?casey: i think it's 12n + 10 .john: that's wrong it is 6n + 32.casey: i see.john: Well i got to go, nice talking to you casey.casey: alright , bye john.